DesktopOverlaysBuild interactive overlays

Write HTML overlay bundles that react to audio, the now-playing track, and your windows. Publish them to the Steam Workshop.

Interactive bundles

Ship your own HTML, CSS, and JavaScript. Each bundle runs in a sandboxed iframe and talks to the app through DesktopOverlaysAPI.

A bundle only gets what it asks for in its manifest and what the user approves at install time. Nothing more.

Audio FFT, Windows now-playing, open windows, and desktop state. Switch surfaces and reveal controls with conditions.

Author a folder, publish to the Steam Workshop from the app, and let users install by subscribing.